.22 Short or Long - Full Octagon Barrel - Questions?

[BairdsTrogon]

Trying to get some information on some Remington Rifles from my Dad's collection.

Directly from his notes: Remington Model 4 Breakdown - .22 short or long - Full Octagon Barrel

Serial # - J308373

Given the serial number, I am curious to find out the following:

2) What is the date of manufacture?

I am having difficulties finding information relating to the serial numbers starting w/ J.

Many Thanks In Advance!